JPH0642071Y2 - Pneumatic automatic door for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a pneumatic automatic door for automobiles used for buses and the like.

<Prior Art> Vehicles for transporting passengers such as buses and taxis are generally equipped with automatic doors.

The automatic door is a device that allows passengers such as a driver to remotely open and close the door, and is for reducing labor and smoothing operation. There are pneumatic type, hydraulic type, electric type, etc. as the automatic door opening / closing type, but the main type is the pneumatic type using vacuum or compressed air as a pressure source in terms of maintenance cost.

FIG. 5 shows a perspective view of a double-fold air type (vacuum type) automatic door mounted on the front part of the bus. In the figure, reference numeral 1 is a door engine that drives the door 2 to open and close.

The pressure source of this door engine 1 is a vacuum, but its control is performed by electricity. Door 2 in FIGS. 6 and 7
The diagrams of the vacuum and electrical systems of the open and closed are shown.

In the figure, 3 is a vacuum pump driven by an engine (not shown), and a negative pressure is generated in the vacuum tank 4 by the vacuum pump 3. A main pipe 5 is connected to the vacuum tank 4, and this main pipe 5 is branched into an open side pipe 6 and a closed side pipe 7 on the way to connect to an open side port 1a and a close side port 1b of the door engine 1, respectively. There is. Here, 1c in the drawing is a door driving rod. The open side pipe 6 and the close side pipe 7 are provided with three-way solenoid valves (hereinafter, first and second solenoid valves) V ₁ and V ₂ , respectively, so that the vacuum tank 4 and the door engine 1 communicate with each other when energized and not energized. The vacuum tank side is shut off, and the door engine side is in communication with the atmosphere.

On the other hand, the current from the battery 8 is led to the open / close switch S ₁ and the first relay R ₁ via the key switch 9 and the fuse 10. The open / close switch S ₁ is a toggle switch that is held in two states: the "open" position and the "closed" position.
When in the position, a current flows through the coil in the first relay R ₁ and is excited. And the first relay
R ₁ is the first solenoid valve V ₁ when the current from the fuse 10 is not energized
To the second solenoid valve V ₂ when the coil is excited.

The operation when the door 2 is opened and closed will be described with reference to FIGS. 6 and 7.

In FIG. 6, the current from the battery 8 is led to the first relay R ₁ via the key switch 9 and the fuse 10,
Since the open / close switch S ₁ is in the “open” position, the coil in the first relay R ₁ is not excited and the first solenoid valve V ₁ is energized.
Therefore, the opening side port 1a of the door engine 1 communicates with the vacuum tank 4 to be evacuated as described above, while the closing side port 1b communicates with the atmosphere because the second solenoid valve V ₂ is not energized. There is. Therefore, the door driving rod 1c moves in the direction of being drawn into the door engine 1 and opens the door 2.

Further, in FIG. 7, since the open / close switch S ₁ is in the “closed” position, the first relay R ₁ is excited and the second solenoid valve V ₂ is energized. Therefore, contrary to the state shown in FIG. 6, the closed port 1b is evacuated and the open port 1a communicates with the atmosphere. Therefore, the door driving rod 1c moves in the direction in which it is extended from the door engine 1 and closes the door 2.

<Problems to be solved by the invention> However, in the automatic door of this configuration, for example, when the key switch 9 is cut off, the open / close switch S ₁ is unintentionally switched, and then the key switch 9 is connected, the door 2 suddenly opens. There is a risk that the vehicle will start moving, or if the vacuum tank 4 is not under negative pressure, it will start operating when the engine is started.

To solve this problem, the open / close switch S ₁ is of the neutral position return type, and a relay is also provided for each solenoid valve V ₁ , V ₂ so that the solenoid valve is not energized and opened when the open / close switch S ₁ is not operated. Conventionally, a method has been considered in which both the side port 1a and the closed side port 1b communicate with the atmosphere side. However, in this method, since the door 2 becomes free when the finger is released from the open / close switch S ₁ (that is, there is no holding function), the open / close switch S ₁ is pressed until the door 2 is locked while the vehicle is stopped on a slope or the like. I had to continue, and it was very inconvenient to use.

<Means for Solving Problems> Therefore, in the present invention, in the pneumatic automatic door for an automobile,
An open side pipe communicating with the open side port of the pneumatic door engine, a closed side pipe communicating with the close side port of the pneumatic door engine, and both of the open side and closed side pipes, each of which is provided in each of the ports. First and second solenoid valves for switching and communicating with a pressure source or the atmosphere, a main pipe between the confluence of both pipes and the pressure source, and the main pipe are provided, and the main pipe is connected or cut off. A third solenoid valve to
A neutral position return type opening / closing switch for controlling energization to each of the solenoid valves, and an opening side port and a closing side port are respectively connected to a pressure source and the atmosphere at the opening position of the opening / closing switch, and at the closing position. The open side port and the close side port are respectively connected to the atmosphere and the pressure source, and in the neutral position, the third solenoid valve shuts off the main pipe and the solenoid of either the first or the second solenoid valve. Only one of the two ports is communicated with the atmosphere by a valve, and the on-off switch and each of the above-mentioned switches are arranged so that the other port is communicated with the main pipe through the other solenoid valve. It was equipped with an electric circuit that connects the solenoid valve.

<Operation> In the pneumatic automatic door for an automobile according to the present invention, since the opening / closing switch is the neutral position return type, the door does not start carelessly when the key switch is connected or the engine is started. Further, at the neutral position of the opening / closing switch, the passage communicating with at least one of the open side port and the close side port is closed, so that the door is held in that state.

<Embodiment> FIGS. 1 to 4 show a vacuum / electrical system diagram of an embodiment of a pneumatic automatic door according to the present invention. FIGS. 1 and 2 show when the door is opened. And at the time of closing, which correspond to FIGS. 6 and 7, respectively. Also, FIGS. 3 and 4 show the open / close switch neutral and the key switch off, respectively.
In the description of the embodiments, the same members as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

As shown in these figures, the main pipe 5 is provided with a two-way solenoid valve V ₃ (hereinafter referred to as a third solenoid valve) which is a third solenoid valve, and the main pipe 5 communicates only when energized. . This third solenoid valve V ₃ is excited by the current from the second relay R ₂ .
The second relay R ₂ is excited when the open / close switch S ₁ is in either the “open” position or the “closed” position, and the third solenoid valve
It is a circuit that energizes V ₃ . In the figure, D ₁ is a diode provided for energizing the coil in the second relay R ₂ when the open / close switch S ₁ is in the “closed” position. Also,
First to third solenoid valves V _1, V _2, V ₃ of the ground wire in the present embodiment is connected via a respective diode _{D 2, D 3, D 4} , and is grounded through the emergency switch S _2.

When the door 2 is opened, the open / close switch as shown in FIG.
Since S ₁ is in the “open” position, the first relay R ₁ is not energized and the second relay R ₂ is energized. Therefore, when the first and third solenoid valves V ₁ and V ₃ are excited, the open side port 1a is evacuated and the close side port 1b is opened to the atmosphere as in the case of opening the conventional example shown in FIG. The door driving rod 1c moves in the direction of opening the door 2 by communicating with the.

When the door 2 is closed, as shown in FIG.
S ₁ is in the “closed” position. In this case, the first relay R ₁ and the second relay R ₂ are both excited, and the second solenoid valve V ₂ and the third solenoid valve
Exciting current is flowing in V ₃ . Therefore, as in the case of closing the conventional example shown in FIG. 7, the closing port 1b is evacuated, the opening port 1a communicates with the atmosphere, and the door driving rod 1c closes the door 2. Move to.

When the open / close switch S ₁ is not operated, the switch is in the neutral position returning type, so that the switch is in the “neutral” position as shown in FIG. In this case, neither the first relay R ₁ nor the second relay R ₂ is excited, and the exciting current flows only in the first solenoid valve V ₁ .
Therefore, the closed port 1b communicates with the atmosphere, but the open port 1a is not communicated with the atmosphere nor the vacuum tank 4 and is blocked. Therefore, the air supply / exhaust to the door engine 1 is not performed, and the movement of the door driving rod 1c is restricted regardless of the opened / closed state of the door 2.

When the key switch 9 is cut off, no current flows in the circuit as shown in FIG. Therefore, the first solenoid valve V ₁
And the second solenoid valve V ₂ are not excited, and both the opening port 1a and the closing port 1b are in communication with the atmosphere. Therefore, the door driving rod 1c is in a free state, and the door 2 can be freely opened and closed from inside and outside by removing a lock (not shown) opened and closed by a door key or the like.

Although not shown, when the emergency switch S ₂ is disconnected in an emergency such as an accident, all the solenoid valves V _{1 to} V ₃ do not operate because they are not grounded, and the drive rod 1c is the same as in FIG. Will be free.

As described above, the pneumatic automatic door of the present embodiment eliminates the above-mentioned problems in the conventional example due to the actions of the neutral position return type opening / closing switch S ₁ and the third solenoid valve V ₃ .

In this embodiment, a relay, a diode or the like is used in the electric circuit, but a circuit using a transistor or the like may be used. Also, the control of the solenoid valve is not limited to that of this embodiment, and for example, when the open / close switch is not operated, the closed port may be closed instead of the open port, or both ports may be closed. Further, in the present embodiment, the open / close switch is kept pressed until the stroke ends at the time of opening or closing, but a limit switch or the like may be used together to open / close even with one touch. Furthermore, although the present embodiment is applied to a bus using a vacuum as a pressure source, compressed air can be used as a pressure source, and the present invention may be applied to other than buses such as taxis. .

<Effect of the Invention> According to the present invention, the pneumatic automatic door includes the neutral position return type opening / closing switch and the third solenoid valve for cutting off the communication between the pressure source and the opening / closing port of the door engine.
When the switch was not operated, the open / close switch was in the neutral position and the door could be held. Therefore, when the key switch is connected, the door does not suddenly start to move, and the door is held even in the half-opened state, but it is possible to operate like an electric type although it is a pneumatic type.

[Brief description of drawings]

1 to 4 are diagrams of a vacuum / electrical system in an embodiment of a vacuum type automatic door according to the present invention. FIG. 1 shows the open position of the open / close switch, and FIG. 2 shows the closed position. The position is shown in FIG. 3 in the “neutral” position and in FIG. 4 when the key switch is disconnected. FIG. 5 is a perspective view of the front part of the bus in which the double-folded automatic door is mounted, and FIGS. 6 and 7 respectively show a conventional vacuum automatic door with the open / close switch in the “open” position and the “open” position. 3 is a diagram of a vacuum / electric system in a “closed” position. In the figure, 1 is a door engine, 2 is a door, 4 is a vacuum tank, 5 is main piping, 6 is open side piping, 7 is closed side piping, 9 is a key switch, S ₁ is an open / close switch, and S ₂ is an emergency switch. , R ₁ is a first relay, R ₂ is a second relay, V ₁ is a first solenoid valve, V ₂ is a second solenoid valve, V ₃ is a third solenoid valve, D _{1 to} D ₄ are diodes.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideki Hayashi, 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor, Koichi Higashi Inouyama City, Aichi Prefecture 35-3, Ishihata, Hashizume

Claims (1)

[Scope of utility model registration request] 1. An open-side pipe communicating with an open-side port of a pneumatic door engine, a closed-side pipe communicating with a closed-side port of the pneumatic door engine, and both of the open-side and closed-side pipes, First and second solenoid valves for switching and communicating the both ports with a pressure source or the atmosphere, a main pipe between a confluence portion of the both pipes and the pressure source, and the main pipe. A third solenoid valve that connects or disconnects the pipe, a neutral position return type open / close switch for controlling energization to each solenoid valve, and an open side port and a close side port at the open position of the open / close switch. In the closed position, the open side port and the closed side port are respectively connected to the atmosphere and the pressure source, and in the neutral position, the third solenoid valve shuts off the main pipe and the first pipe One or second solenoid valve Only one of the two ports is communicated with the atmosphere by one of the solenoid valves, and the other port is communicated with the main pipe through the other solenoid valve. A pneumatic automatic door for an automobile, comprising an opening / closing switch and an electric circuit for connecting the solenoid valves.